Oil field drilling fluid impurity filter

Abstract

The utility model relates to the technical field of drilling equipment, and discloses an oil field drilling fluid impurity filter which comprises a rotating rod and a drill bit, the outer wall of the bottom end of the rotating rod is in threaded connection with a plurality of first bolts, the outer wall of the top end of the rotating rod is connected with a liquid drainage pipe through a liquid drainage set so that the rotating rod can drain liquid, and the inner wall of the drill bit is fixedly connected with an inner shell plate. The inner wall of the top end of the inner shell plate is connected with a rotating rod through a moving set so as to block stone entering from the drill bit, the outer walls of the upper end and the lower end of the rotating rod are rotationally connected with connecting rings, and the outer walls of the connecting rings are connected with blocking plates through protection sets so that the blocking plates can be opened outwards. According to the sand scraping device, the effects that too large drilling cuttings are prevented from entering the filter screen through opening and closing of the blocking plate, the filter screen is prevented from being damaged by the drilling cuttings are achieved, and the effect that the sand scraping rod cleans the small drilling cuttings blocked in the filter screen through the transmission rod is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling equipment, in particular to an oilfield drilling fluid impurity filter. Background Art

[0002] Oilfield drilling fluid impurity filter is a device used to remove solid particles and impurities from drilling fluid during the drilling process. Drilling fluid plays a vital role in the drilling process, such as cooling the drill bit, carrying drill cuttings, balancing formation pressure, etc. However, as drilling progresses, a large amount of solid particles will be mixed into the drilling fluid, such as rock cuttings, additive particles in the mud, etc. If these particles are not filtered out in time, they will affect the performance of the drilling fluid and may even cause equipment wear and downhole accidents.

[0003] After searching, a filter for drilling fluid production with announcement number CN213743309U includes a drill pipe, a baffle plate is provided inside the drill pipe, a filter is provided inside the drill pipe, and both sides of the top of the filter are installed with the baffle plate, and both sides of the bottom of the filter are installed with limit plates, and the inner wall of the drill pipe is symmetrically installed with fixed blocks, and the bottom of the limit plate is installed with a connecting block. The utility model sets a baffle plate, a filter and a limit plate, so that impurities in the drilling fluid flow into the filter through the outlet groove of the drill bit, and then enter the empty grooves on both sides of the filter through the through holes on the surface of the filter, thereby collecting impurities and preventing impurities from clogging the instrument. By setting a first gasket, a second gasket, a bolt and a screw, when it is necessary to replace the drill bit or lengthen the drill pipe, the drill bit or drill pipe can be installed and disassembled through the first gasket and the second gasket in conjunction with the bolt and the screw, thereby adapting to drilling of different depths.

[0004] Based on the above patent, by setting a blocking plate, a filter and a limit plate, when drilling operations are carried out, impurities in the drilling fluid flow into the filter through the water outlet groove of the drill bit, and then enter the empty grooves on both sides of the filter through the through holes on the surface of the filter, thereby collecting the impurities to prevent the impurities from clogging the instrument. By setting a first gasket, a second gasket, a bolt and a screw, when the drill bit needs to be replaced or the drill rod needs to be lengthened, the drill bit or drill rod can be installed and disassembled through the first gasket and the second gasket in conjunction with the bolts and screws to adapt to drilling at different depths. However, in this patent, when the drill bit is drilling underground, during the drilling process, some particles of drill cuttings are as large as bricks, while some particles are as small as fine sand. When the drilling fluid flows, large particles of bricks are easy to collide with the filter screen, causing damage to the filter screen and affecting the filtering effect of the device. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art and to propose an oilfield drilling fluid impurity filter to prevent excessive drill cuttings from damaging the filter screen. The transmission rod enables the scraping rod to clean the fine drill cuttings blocked in the filter screen.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] An oilfield drilling fluid impurity filter, comprising:

[0008] A rotating rod, wherein the outer wall of the bottom end of the rotating rod is threadedly connected to a plurality of first bolts, and the outer wall of the top end of the rotating rod is connected to a drainage pipe through a drainage group for draining liquid from the rotating rod;

[0009] A drill bit, wherein the inner wall of the drill bit is fixedly connected to an inner shell plate, the inner wall of the top end of the inner shell plate is connected to a rotating rod through a movable group, so as to block stones entering from the drill bit, and the outer walls of the upper and lower ends of the rotating rod are rotatably connected to connecting rings, and the outer wall of the connecting ring is connected to a blocking plate through a protective group, so as to prevent the plate from opening outward;

[0010] The mounting ring has filter screens fixedly connected to the four sides of the inner wall of the mounting ring, the left and right sides of the bottom end of the mounting ring are threadedly connected with second bolts, the inner wall of the top end of the mounting ring is connected to the connecting frame through the cleaning group for cleaning the inside of the mounting ring, the inner wall of the bottom end of the mounting ring is fixedly connected to the inner groove ring, and the inner wall of the inner groove ring is connected to the scraping rod through the gear group for rotation of the scraping rod.

[0011] Furthermore, the drainage group includes a sleeve ring rotatably connected to the outer wall of the top end of the rotating rod, and the opposite end of the drainage pipe is fixedly connected to the four sides of the outer wall of the sleeve ring and passes through it.

[0012] Furthermore, the moving group includes a fixed tube fixedly connected to the inner wall of the top end of the inner shell plate, the bottom end of the rotating rod is fixedly connected to a screw, and the bottom end of the screw is threadedly connected to the bottom end of the inner wall of the fixed tube.

[0013] Furthermore, the protection group includes a plurality of traction rods rotatably connected to the outer wall of the connecting ring, and the opposite ends of the traction rods are rotatably connected to the opposite end of the blocking plate.

[0014] Furthermore, the cleaning group includes a transmission rod rotatably connected to the inner wall of the top end of the mounting ring, and the top end of the connecting frame is fixedly connected to the bottom end of the transmission rod.

[0015] Furthermore, the gear set includes an inner gear ring fixedly connected to the bottom end of the inner wall of the inner groove ring and a transmission gear fixedly connected to the bottom end of the scraper rod. The inner gear ring and the transmission gear are meshed, and the top end of the inner groove ring is rotatably connected to a closed ring.

[0016] Furthermore, the top end of the drill bit is detachably connected to the outer wall of the first bolt, and the opposite end of the second bolt passes through the mounting ring and is detachably connected to the inner wall of the rotating rod.

[0017] Furthermore, the blocking plate is rotatably connected to the upper and lower outer walls of the fixed tube at one end, and the bottom end of the scraping rod passes through the bottom end of the connecting frame and is rotatably connected to the top end of the closed ring.

[0018] The utility model has the following beneficial effects:

[0019] 1. In the present invention, the opening and closing of the blocking plate blocks excessive drill cuttings from entering the filter, thereby preventing the drill cuttings from damaging the filter. This prevents the filter from being clogged due to the accumulation of large particles, thereby ensuring the stable operation of the filtration system, avoiding downtime and production interruptions, and allowing the filter to focus more on filtering smaller impurity particles, thereby improving filtration efficiency.

[0020] 2. In the utility model, the scraping rod can clean the fine drill cuttings blocked in the filter screen through the transmission rod, so that the device can reduce the wear and pressure accumulation of the filter screen, extend its service life, reduce replacement and maintenance costs, and ensure that the filtration system always operates in the best condition, thereby improving the overall efficiency and stability of the entire drilling operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a three-dimensional diagram of an oilfield drilling fluid impurity filter proposed by the utility model;

[0022] Figure 2 This is a half-section diagram of a rotating rod of an oilfield drilling fluid impurity filter proposed by the utility model;

[0023] Figure 3 This is a half-section diagram of a drill bit for an oilfield drilling fluid impurity filter proposed by the utility model;

[0024] Figure 4 This is a half-section diagram of a fixed pipe of an oilfield drilling fluid impurity filter proposed by the utility model;

[0025] Figure 5 This is a half-section diagram of the installation ring of an oilfield drilling fluid impurity filter proposed by the utility model;

[0026] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0027] Legend:

[0028] 1. Rotating rod; 2. Casing ring; 3. Drain pipe; 4. First bolt; 5. Drill bit; 6. Inner shell plate; 7. Fixed pipe; 8. Rotating rod; 9. Connecting ring; 10. Drawbar; 11. Blocking plate; 12. Screw; 13. Filter screen; 14. Second bolt; 15. Mounting ring; 16. Transmission rod; 17. Connecting frame; 18. Scraping rod; 19. Inner groove ring; 20. Transmission gear; 21. Inner gear ring; 22. Sealing ring. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Reference Figure 1 and Figure 2 The utility model provides an embodiment of an oilfield drilling fluid impurity filter, comprising:

[0031] The rotating rod 1 has a plurality of first bolts 4 threadedly connected to the outer wall of the bottom end of the rotating rod 1, a sleeve ring 2 is rotatably connected to the outer wall of the top end of the rotating rod 1, and the opposite end of the discharge pipe 3 is fixedly connected to the four sides of the outer wall of the sleeve ring 2 and passes through.

[0032] Specifically: by using the first bolt 4 to assemble the rotating rod 1 and the drill bit 5, the drill bit 5 and the rotating rod 1 can effectively perform oil well drilling operations through external drilling equipment. During the drilling process, the second bolt 14 is used to firmly fix the mounting ring 15 inside the rotating rod 1, thereby ensuring that the filter screen 13 on the mounting ring 15 can operate normally and efficiently filter the drilling fluid flowing through. When the drilling fluid enters and passes through the filter screen 13, the filter screen 13 will intercept and remove solid impurities and particles in the liquid, ensuring that the outflowing drilling fluid reaches the required cleanliness. The filtered drilling fluid is then discharged through the drain pipe 3 set at the casing ring 2, ensuring that the filtered drilling fluid flows smoothly into other transmission pipelines for further processing or recycling.

[0033] Reference Figure 3 and Figure 4, drill bit 5, the inner wall of the drill bit 5 is fixedly connected to the inner shell plate 6, the upper and lower outer walls of the rotating rod 8 are rotatably connected to the connecting ring 9, the top inner wall of the inner shell plate 6 is fixedly connected to the fixed tube 7, the bottom end of the rotating rod 8 is fixedly connected to the screw 12, the bottom end of the screw 12 is threadedly connected to the bottom end of the inner wall of the fixed tube 7, the outer wall of the connecting ring 9 is rotatably connected to several traction rods 10, the opposite end of the traction rod 10 is rotatably connected to the opposite end of the blocking plate 11, the top of the drill bit 5 is detachably connected to the outer wall of the first bolt 4, and the blocking plate 11 is rotatably connected to the upper and lower outer walls of the fixed tube 7 at the opposite end.

[0034] Specifically: when the drill bit 5 is drilling, the baffle 11 has a protective function by blocking larger drill cuttings in the liquid transmitted by the drill bit 5, thereby preventing these overly large drill cuttings from damaging the filter screen 13. The baffle 11 is designed to protect the filter screen 13, ensuring that it can perform high-efficiency filtration in a long-term and stable manner without being damaged or blocked by large particles of drill cuttings. In addition, by rotating the rotating rod 8, the operator can make the rotating rod 8 move linearly along the screw 12 in the fixed tube 7. The movement of the rotating rod 8 is transmitted to the traction rod 10 through the connecting ring 9, thereby driving the baffle 11 to open and close inside the drill bit 5. This mechanism allows the device to automatically adjust the opening and closing angles of the baffle 11 according to the different soil conditions encountered during the drilling process and the size of the drill cuttings generated. When drilling encounters larger particles of drill cuttings, the baffle 11 is adjusted to narrow the opening and closing gap, thereby effectively blocking these larger particles from entering the filter screen 13 area.

[0035] Reference Figure 5 and Figure 6 , mounting ring 15, the four sides of the inner wall of the mounting ring 15 are fixedly connected to the filter screen 13, the left and right sides of the bottom end of the mounting ring 15 are threadedly connected to the second bolts 14, the inner wall of the bottom end of the mounting ring 15 is fixedly connected to the inner groove ring 19, the transmission rod 16 rotatably connected to the inner wall of the top of the mounting ring 15, the top of the connecting frame 17 is fixedly connected to the bottom end of the transmission rod 16, the inner gear ring 21 fixedly connected to the bottom end of the inner wall of the inner groove ring 19 and the transmission gear 20 fixedly connected at the bottom end of the scraping rod 18, the inner gear ring 21 and the transmission gear 20 are meshedly connected, the top of the inner groove ring 19 is rotatably connected to the closed ring 22, the opposite end of the second bolt 14 passes through the mounting ring 15 and is detachably connected to the inner wall of the rotating rod 1, the bottom end of the scraping rod 18 passes through the bottom end of the connecting frame 17 and is rotatably connected to the top of the closed ring 22.

[0036] Specifically: after the drilling fluid is filtered through the filter 13, in order to prevent sand and gravel particles from clogging the filter 13 and maintain its long-term efficient operation, when the filter 13 needs to be cleaned, the rotating rod 1 is removed from the drilling equipment, and the transmission rod 16 is rotated to drive the connecting frame 17 to move, thereby driving the scraping rod 18 to perform the scraping operation. The rotation of the transmission rod 16 causes the connecting frame 17 to link the scraping rod 18, so that the transmission gear 20 of the scraping rod 18 moves smoothly along the inner gear ring 21. When the scraping rod 18 is driven to rotate by the transmission gear 20 on the connecting frame 17, the scraping rod 18 is close to the surface of the filter 13 for scraping, which can effectively remove sand and gravel and other solid particles attached to the surface of the filter 13, prevent these particles from accumulating and causing the filter 13 to be blocked, and thus maintain the good permeability of the filter 13.

[0037] Working principle: The rotating rod 1 and the drill bit 5 are assembled by the first bolt 4, so that the drill bit 5 can dig the oil well, and the second bolt 14 can install the mounting ring 15 in the rotating rod 1, so that the filter 13 at the mounting ring 15 can filter the drilling fluid. When the drill bit 5 is drilling, the blocking plate 11 blocks the large particles of drill cuttings in the liquid transmitted by the drill bit 5 to prevent the excessive drill cuttings from damaging the filter 13. When the rotating rod 8 is rotated, the rotating rod 8 is moved in the fixed pipe 7 through the screw 12, and the rotating rod 8 drives the traction rod 10 to drive the blocking plate 11 to open and close the angle in the drill bit 5 through the connecting ring 9, so that the device can adjust the opening and closing angle according to the drilling soil. The size of the drill cuttings is mechanically isolated by the opening and closing gap, so that the blocking plate 11 blocks the drill cuttings. After the drilling fluid is filtered through the filter screen 13, it is discharged from the drain pipe 3 at the sleeve ring 2, and the drain pipe 3 can be fixed to other transmission pipes. After filtering, when the transmission rod 16 rotates, the transmission rod 16 drives the connecting frame 17 to move the transmission gear 20 at the scraping rod 18 along the inner gear ring 21, so that the scraping rod 18 rotates at the connecting frame 17 through the transmission gear 20, and the connecting frame 17 is rotated by the transmission rod 16, so that the rotating scraping rod 18 scrapes the filter screen 13 to avoid sand and gravel clogging the filter screen 13 and maintain the filtering effect of the filter screen 13.

[0038] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An oilfield drilling fluid impurity filter, characterized in that: include: A rotating rod (1), wherein the outer wall of the bottom end of the rotating rod (1) is threadedly connected to a plurality of first bolts (4), and the outer wall of the top end of the rotating rod (1) is connected to a drainage pipe (3) through a drainage group for draining the rotating rod (1); A drill bit (5), wherein the inner wall of the drill bit (5) is fixedly connected to an inner shell plate (6), the inner wall of the top end of the inner shell plate (6) is connected to a rotating rod (8) through a moving group, so as to block stones entering from the drill bit (5), the outer walls of the upper and lower ends of the rotating rod (8) are rotatably connected to connecting rings (9), and the outer wall of the connecting ring (9) is connected to a blocking plate (11) through a protective group, so as to block the plate (11) from opening outwards; The mounting ring (15) is fixedly connected to the filter screen (13) on four sides of the inner wall of the mounting ring (15), and the left and right sides of the bottom end of the mounting ring (15) are threadedly connected to the second bolt (14). The inner wall of the top end of the mounting ring (15) is connected to the connecting frame (17) through a cleaning group for cleaning the inside of the mounting ring (15). The inner wall of the bottom end of the mounting ring (15) is fixedly connected to the inner groove ring (19), and the inner wall of the inner groove ring (19) is connected to the scraping rod (18) through a gear group for rotating the scraping rod (18).

2. The oilfield drilling fluid impurity filter according to claim 1, characterized in that: The drainage group comprises a sleeve ring (2) rotatably connected to the outer wall of the top end of the rotating rod (1); the drainage pipe (3) is fixedly connected to the four sides of the outer wall of the sleeve ring (2) at one opposite end and passes through the sleeve ring (2).

3. The oilfield drilling fluid impurity filter according to claim 1, characterized in that: The moving group comprises a fixed tube (7) fixedly connected to the inner wall of the top end of the inner shell plate (6); the bottom end of the rotating rod (8) is fixedly connected to a screw rod (12); and the bottom end of the screw rod (12) is threadedly connected to the bottom end of the inner wall of the fixed tube (7).

4. The oilfield drilling fluid impurity filter according to claim 1, characterized in that: The protection group comprises a plurality of traction rods (10) rotatably connected to the outer wall of the connection ring (9), and the opposite ends of the traction rods (10) are rotatably connected to the opposite end of the blocking plate (11).

5. The oilfield drilling fluid impurity filter according to claim 1, characterized in that: The cleaning group comprises a transmission rod (16) rotatably connected to the inner wall of the top end of the mounting ring (15), and the top end of the connecting frame (17) is fixedly connected to the bottom end of the transmission rod (16).

6. The oilfield drilling fluid impurity filter according to claim 1, characterized in that: The gear set comprises an inner gear ring (21) fixedly connected to the bottom end of the inner wall of the inner groove ring (19) and a transmission gear (20) fixedly connected to the bottom end of the scraping rod (18); the inner gear ring (21) and the transmission gear (20) are meshedly connected, and a closed ring (22) is rotatably connected to the top end of the inner groove ring (19).

7. The oilfield drilling fluid impurity filter according to claim 1, characterized in that: The top end of the drill bit (5) is detachably connected to the outer wall of the first bolt (4), and the opposite end of the second bolt (14) passes through the mounting ring (15) and is detachably connected to the inner wall of the rotating rod (1).

8. The oilfield drilling fluid impurity filter according to claim 1, characterized in that: The blocking plate (11) is rotatably connected to the upper and lower outer walls of the fixed tube (7) at one end, and the bottom end of the scraping rod (18) passes through the bottom end of the connecting frame (17) and is rotatably connected to the top end of the closed ring (22).

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